For starters, it sounds like you are managing your expectations perfectly. Taking babysteps is critical if this is going to be something you are going to consistently adhere to from here on out... so good job!
By 'cleaning up' the
diet of the obviously poor stuff (soda and fast food) good things will happen. Once you have it under wraps, remember to consistently add something to the 'pipeline' to work towards.
While you've made a great first step, it's only one step of many that will have to be made.
Oh, and you made another big step, which I didn't mean to discredit. You started walking... which is also fantastic. How often do you plan on doing this?
About being picky, maybe you could search for healthy
recipes. I think there are quite a few threads here relating to healthy goodies and I'm sure some people here have some
recipe websites they can share.
Remember, not every single morsel of food you put in your mouth has to be 'clean.' That sort of all-or-nothing thinking is what leads most to failure with their diets. You want a majority of your intake to come from 'healthy' stuff, but I think allowing some room for stuff that will act as a psychological buffer is important... ya know, the stuff you can't live without. It can co-exist with the 'clean foods' in your
diet as long as moderation is maintained.
In general, and this is by no means a complete list, here are some 'clean' foods:
Protein - chicken breast, turkey breast, pork tenderloin, fish, lean ground beef, flank or top round steaks, whey protein, eggs, low/no
fat dairy (these can go in the carbs category too)
Fats - natural peanut butter, fish, fish oil pills, extra virgin olive oil, nuts, avocados, flax
Carbs - fruits, veggies, oatmeal, rice, whole grain/high fiber bread, wraps, whole wheat pasta, yams
Best to you in finding how to optimize your plan. I hope you're able to pull some good ideas from this site.